Here is an underrated and effective set i have been using:
Aerodactyl @ Life Orb
EVs: 252 Atk / 4 SpD / 252 Spe
- Stone Edge
With the introduction of Tornadus-T, most offensive team without Jirachi have been struggling to deal with it, and mine was no exception. So i tried this little dino and i was very impressed. In case you didn't know, Aerodactyl can take everyhting Tornadus-T can throw at it, resisting its main STAB move, while outspeeding and OHKOing back. Oh and it has reliable recovery too! With max Speed Jolly you outspeed everything 'till Timid ScarfToed, including Tornadus-T, while hitting quite hard and with good coverage due to base 105 Atk + LO + EdgeQuake combo. It also has Taunt to prevent any set-up from annoying pokes such as Deoxys-D, Gliscor, Skarmory and Chansey / Blissey, so it helps a lot vs stall and hyper offense teams (outspeeds every single Dual Screener). But unfortunately Aerodactyl is easily walled by physical walls, which means that it will have a hard time against balanced and stall teams (this is somewhat mitigated by Taunt and Roost though). In the other hand, versus offensive teams, Aero is wonderful as its blazing speed and good power allows it to put huge holes in the opponent's team, while also revenge killing anything unscarfed in OU.
Now let's see some prominent threats that make Aero's life harder:
Hippowdon with Ice Fang / Stone Edge
Which means that Xatu with Heat Wave, and a physically defensive spread is an excellent partner, because together they can prevent hazards from almost every hazard setter when used correctly (most stuff that Xatu can't prevent from laying SR, such as Heatran and non Scarfed Terrakion, are dealt with Aerodactyl). Of 'course they don't have good synergy type-wise as you can see, as they have exactly the same weaknesses, but pokemon is not about covering types, is about covering actual pokes, and Xatu does a very good job at handling many pokes that give Aero trouble, while helping keep momentum with U-turn and preventing hazards from being up.